Forum antique de Bavay, Archaeological forum and museum in Bavay, France.

The Forum antique de Bavay combines excavated Roman remains with a museum building designed by Waldschmidt and Jourdain. Low walls of reddish brick and grey stone trace rectangular outlines on pale gravel, crossed by a raised metal walkway with mesh railings. A long open-sided shelter on slender grey columns stands behind the ruins, and a 6,400 m² galvanised steel roof inaugurated on 14 May 2022 covers the cryptoporticus.

Bagacum Nerviorum, capital of the Nervii, stood at a road junction on the Via Belgica. Its forum was built in two main phases between the 1st and late 2nd century AD, with a 98 m basilica and a 240 m by 100 m enclosure. In the late 3rd century it was fortified; the last record of the site dates to 430.

The museum's centrepiece is a hoard of 370 Roman bronzes found on the site on 12 July 1969, mostly statuettes and fittings. A 3D reconstruction of Bagacum has been shown since 2004 and is updated as excavations continue. The site lies on the Voie romaine Bavay-Velzeke tourist route, opposite the church of Notre-Dame de l'Assomption.

The site and museum stand at 2 allée chanoine Biévelet, opposite the Notre-Dame de l'Assomption church near Bavay's centre. A 6,400 m² galvanised steel roof, inaugurated on 14 May 2022, shelters the cryptoporticus and a visit route accessible to people with reduced mobility, with mediation stations along the way. The museum lies beside the ruins.

The civil basilica uncovered at the site is 98 metres long; the forum enclosure measured about 100 by 240 metres, and the whole complex covers more than 2.5 hectares, making it one of the largest known in the Roman world.